Re-format BUCK to use recommended style.
Re-format BUCK to use recommended style.

Summary:
These files previously could not be formatted because they
had complex syntax `buildifier` did not support. Now it supports it
so it's time to format things nicely.

Differential Revision: D8073536

fbshipit-source-id: b02ef7ba736cef19dd204a2e71382bd1a4336d3d

facebook/SoLoader,facebook/SoLoader,facebook/SoLoader